Pronina-Nestell, G. P.; Nestell, M. K. (2001). Late Changhsingian foraminifers of the northwestern Caucasus. Micropaleontology. 47(3), 205-234., available online at (https://doi.org/10.2113/47.3.205) page(s): p. 213, pl. 1, figs. 18-21 (holotype fig. 20).
